Round 6.7086 to the nearest thousandth

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1

The area of each triangle is 7 square units. the surface area of the triangular prism is